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/*
* Copyright (C) 2012, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
#include "third_party/blink/renderer/modules/webaudio/media_stream_audio_destination_node.h"
#include "third_party/blink/public/platform/web_rtc_peer_connection_handler.h"
#include "third_party/blink/renderer/modules/webaudio/audio_context.h"
#include "third_party/blink/renderer/modules/webaudio/audio_node_input.h"
#include "third_party/blink/renderer/modules/webaudio/audio_node_options.h"
#include "third_party/blink/renderer/modules/webaudio/base_audio_context.h"
#include "third_party/blink/renderer/platform/bindings/exception_messages.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/mediastream/media_stream_center.h"
#include "third_party/blink/renderer/platform/uuid.h"
#include "third_party/blink/renderer/platform/wtf/locker.h"
namespace blink {
// WebAudioCapturerSource ignores the channel count beyond 8, so we set the
// block here to avoid anything can cause the crash.
static const unsigned long kMaxChannelCount = 8;
MediaStreamAudioDestinationHandler::MediaStreamAudioDestinationHandler(
AudioNode& node,
size_t number_of_channels)
: AudioBasicInspectorHandler(kNodeTypeMediaStreamAudioDestination,
node,
node.context()->sampleRate(),
number_of_channels),
mix_bus_(AudioBus::Create(number_of_channels,
AudioUtilities::kRenderQuantumFrames)) {
source_ = MediaStreamSource::Create("WebAudio-" + CreateCanonicalUUIDString(),
MediaStreamSource::kTypeAudio,
"MediaStreamAudioDestinationNode", false,
MediaStreamSource::kReadyStateLive, true);
MediaStreamSourceVector audio_sources;
audio_sources.push_back(source_.Get());
MediaStreamSourceVector video_sources;
stream_ = MediaStream::Create(
node.context()->GetExecutionContext(),
MediaStreamDescriptor::Create(audio_sources, video_sources));
MediaStreamCenter::Instance().DidCreateMediaStreamAndTracks(
stream_->Descriptor());
source_->SetAudioFormat(number_of_channels, node.context()->sampleRate());
SetInternalChannelCountMode(kExplicit);
Initialize();
}
scoped_refptr<MediaStreamAudioDestinationHandler>
MediaStreamAudioDestinationHandler::Create(AudioNode& node,
size_t number_of_channels) {
return base::AdoptRef(
new MediaStreamAudioDestinationHandler(node, number_of_channels));
}
MediaStreamAudioDestinationHandler::~MediaStreamAudioDestinationHandler() {
Uninitialize();
}
void MediaStreamAudioDestinationHandler::Process(size_t number_of_frames) {
// Conform the input bus into the internal mix bus, which represents
// MediaStreamDestination's channel count.
// Synchronize with possible dynamic changes to the channel count.
MutexTryLocker try_locker(process_lock_);
// If we can get the lock, we can process normally by updating the
// mix bus to a new channel count, if needed. If not, just use the
// old mix bus to do the mixing; we'll update the bus next time
// around.
if (try_locker.Locked()) {
unsigned count = ChannelCount();
if (count != mix_bus_->NumberOfChannels()) {
mix_bus_ = AudioBus::Create(count, AudioUtilities::kRenderQuantumFrames);
// setAudioFormat has an internal lock. This can cause audio to
// glitch. This is outside of our control.
source_->SetAudioFormat(count, Context()->sampleRate());
}
}
mix_bus_->CopyFrom(*Input(0).Bus());
// consumeAudio has an internal lock (also used by setAudioFormat).
// This can cause audio to glitch. This is outside of our control.
source_->ConsumeAudio(mix_bus_.get(), number_of_frames);
}
void MediaStreamAudioDestinationHandler::SetChannelCount(
unsigned long channel_count,
ExceptionState& exception_state) {
DCHECK(IsMainThread());
// Currently the maximum channel count supported for this node is 8,
// which is constrained by m_source (WebAudioCapturereSource). Although
// it has its own safety check for the excessive channels, throwing an
// exception here is useful to developers.
if (channel_count < 1 || channel_count > MaxChannelCount()) {
exception_state.ThrowDOMException(
DOMExceptionCode::kNotSupportedError,
ExceptionMessages::IndexOutsideRange<unsigned>(
"channel count", channel_count, 1,
ExceptionMessages::kInclusiveBound, MaxChannelCount(),
ExceptionMessages::kInclusiveBound));
return;
}
// Synchronize changes in the channel count with process() which
// needs to update m_mixBus.
MutexLocker locker(process_lock_);
AudioHandler::SetChannelCount(channel_count, exception_state);
}
unsigned long MediaStreamAudioDestinationHandler::MaxChannelCount() const {
return kMaxChannelCount;
}
// ----------------------------------------------------------------
MediaStreamAudioDestinationNode::MediaStreamAudioDestinationNode(
AudioContext& context,
size_t number_of_channels)
: AudioBasicInspectorNode(context) {
SetHandler(
MediaStreamAudioDestinationHandler::Create(*this, number_of_channels));
}
MediaStreamAudioDestinationNode* MediaStreamAudioDestinationNode::Create(
AudioContext& context,
size_t number_of_channels,
ExceptionState& exception_state) {
DCHECK(IsMainThread());
if (context.IsContextClosed()) {
context.ThrowExceptionForClosedState(exception_state);
return nullptr;
}
return new MediaStreamAudioDestinationNode(context, number_of_channels);
}
MediaStreamAudioDestinationNode* MediaStreamAudioDestinationNode::Create(
AudioContext* context,
const AudioNodeOptions& options,
ExceptionState& exception_state) {
DCHECK(IsMainThread());
// Default to stereo; |options| will update it approriately if needed.
MediaStreamAudioDestinationNode* node =
new MediaStreamAudioDestinationNode(*context, 2);
// Need to handle channelCount here ourselves because the upper
// limit is different from the normal AudioNode::setChannelCount
// limit of 32. Error messages will sometimes show the wrong
// limits.
if (options.hasChannelCount())
node->setChannelCount(options.channelCount(), exception_state);
node->HandleChannelOptions(options, exception_state);
return node;
}
MediaStream* MediaStreamAudioDestinationNode::stream() const {
return static_cast<MediaStreamAudioDestinationHandler&>(Handler()).Stream();
}
} // namespace blink
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